<template>
  <form>
    <button type="button" @click="add">加</button>
    <button type="button" @click="sub">减</button>
  </form>
</template>
<script setup>

const emit = defineEmits('add','sub')

const add = () => {
    emit('add')
}

const sub = () => {
    emit('sub')
}

</script>

<style scoped>
form {
  padding: 10px;
}
</style>